A REVIEW ON ECO-FRIENDLY SYNTHESIS OF SILVER NANOPARTICLES FROM PLANTS OF FIVE DIFFERENT FAMILIES AND ITS APPLICATION IN MEDICINAL FIELD

Abstract

Metallic nanoparticles have wide applications in industrial and also in medicinal field. In this review a green synthesis of silver nanoparticles was reported from five different plant families namely Euphorbiaceae, Bignoniaceae, Rhamnaceae, Fabaceae and Apocynaceae. In all the researches, to prepare silver nanoparticles, a stock solution of silver nitrate was bioreduced by mixing with aqueous plant extracts. Synthesized silver nanoparticles were characterized by UV-Vis Spectroscopy, FT-IR, EDAX, XRD, DLS, SEM and TEM analysis. Visual characterization was confirmed by observing the formation of deep brown colour from colourless silver nitrate solution due to Surface Plasmon Resonance (SPR). UV-Vis spectrum showed the characteristic absorption maxima in the wavelength range 400-460 nm. FT-IR studies showed the presence of different phytochemicals which were responsible for bio-reduction and capping. In all the reports the XRD study showed the face centre cubic (fcc) crystalline form of the synthesized nanoparticles. The SEM and TEM studies revealed the spherical morphology and sized range in between 10-90 nm. The formed AgNPs had good antimicrobial activity against different Gram positive, Gram negative bacteria and some pathogenic fungus like Klebsiella pneumonia, Escherichia coli, Bacillus subtilis, Aspergillus niger etc. Again AgNPs also exhibited cytotoxic and wound healing activity.